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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 601. |
Chromosomes at anaphase are of various shapes depending upon position of centromere. It is J shaped when centromere isA. metacentricB. telocentricC. acrocentricD. submetacentric |
| Answer» Correct Answer - D | |
| 602. |
During anaphase I of meiosisA. homologous chromosomes separateB. non-homologous autosomes separateC. sister chromatids separateD. non-sister chromatids separate |
| Answer» Correct Answer - A | |
| 603. |
L- shaped chromosomes are termed :A. metacentricB. acrocentricC. telocentricD. submetacentric |
| Answer» Correct Answer - D | |
| 604. |
The spindle fibres are composed foA. 3% RNA and 97% tubulinB. 10% RNA and 90% tubulinC. 15% RNA and 85% tubulinD. 22% RNA and 78% tubulin |
| Answer» Correct Answer - A | |
| 605. |
Meiosis II leads toA. separation of homologous chromosomesB. separation of chromatids and centromeresC. fresh DNA synthesisD. separation of sex chromosomes |
| Answer» Correct Answer - B | |
| 606. |
In which of the following phases, splitting of the centrosomes of each chromosomes allow them to move towards opposite poles of the cell ?A. Anaphase IIB. Metaphase IIC. Prophase IID. Telophase II |
| Answer» Correct Answer - A | |
| 607. |
During their migratio towards poles chromosomes may appearA. submetacentric, metacentric and acrocentricB. metacentric and acrocentricC. acrocentric, telocentric, submetacentric and metacentricD. acrocentric and telocentric |
| Answer» Correct Answer - C | |
| 608. |
Centromere is rquired forA. TranscriptionB. Crossing overC. Cytoplasmic cleavageD. Movement of Chromosomes towards poles |
| Answer» Correct Answer - D | |
| 609. |
Centromere is rquired forA. Crossing overB. TranscriptionC. Cytoplasmic cleavageD. Movement of chromosomes towards poles |
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Answer» Correct Answer - D Centromere is required for movement of chromsomes towards poles. |
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| 610. |
Which of the phase is the longest?A. ProphaseB. MetaphaseC. AnaphaseD. Telophase |
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Answer» Correct Answer - A Prophase of mitosis is the longest phase. |
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| 611. |
Synapsis occurs between :A. a make and a female gameteB. mRNA and ribosomesC. spindle fibres and centromereD. two homologous chromosomes |
| Answer» Correct Answer - D | |
| 612. |
During cell growth, DNA synthesis takes place inA. S-phaseB. `G_(1)`-phaseC. `G_(2)`-phaseD. M-phase |
| Answer» Correct Answer - A | |
| 613. |
Chromatid formation takes place inA. S-phaseB. metaphaseC. `G_(1)`-phaseD. `G_(2)`-phase |
| Answer» Correct Answer - A | |
| 614. |
The enzyme recombinase is required in which stage of meiosis ?A. DiakinesisB. PachyteneC. ZygoteneD. Diplotene |
| Answer» Correct Answer - B | |
| 615. |
Select the correct option A. `{:(A,B,C,D),("(ii)","(iii)","(v)","(iv)"):}`B. `{:(A,B,C,D),("(i)","(ii)","(v)","(iv)"):}`C. `{:(A,B,C,D),("(ii)","(iii)","(iv)","(v)"):}`D. `{:(A,B,C,D),("(ii)","(i)","(iii)","(iv)"):}` |
| Answer» Correct Answer - A | |
| 616. |
Which of the following is not a characteristic feature during mitosis in somatic cells ?A. SynapsisB. Spindle FibresC. Disappearance of nucleolusD. Chromosome movement |
| Answer» Correct Answer - A | |
| 617. |
Which of the following is not a characteristic feature during mitosis in somatic cells ?A. disappearance of nucleolusB. chromosomes movementC. synapsisD. spindle fibres |
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Answer» Correct Answer - C Synapsis is pairing of homologous chromosomes. It occurs during zygotene stage of meiosis-I. the homologous chromosoems come closer leading to formation of cross over in the next stage called pachytene. These are not observed during mitosis. |
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| 618. |
Which of the following is not a characteristic feature during mitosis in somatic cells ?A. Spindle fibresB. Disappearance of nucleolusC. Chromosome movementD. Synapsis |
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Answer» Correct Answer - D Synapsis is not a chracteristic feature during mitosis in somatic cells. |
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| 619. |
Which of the following is not a characteristic feature during mitosis in somatic cells ?A. Disappearance of nucleolusB. Chromosome movementC. SynapsisD. Spindle fibres |
| Answer» Correct Answer - C | |
| 620. |
Spindle fibres unite with which structure of chromosomes ?A. ChromocentreB. ChromomereC. KinetochoreD. Centriole |
| Answer» Correct Answer - C | |
| 621. |
Best material for studying mitosis in laboratory isA. AntherB. Root tipC. Leaf tipD. Ovary |
| Answer» Correct Answer - B | |
| 622. |
Each chromosome at anaphase stage of bone marrow cell in our body hasA. Two chromatidsB. Several chromatidsC. No chromatidsD. Only one chromatid |
| Answer» Correct Answer - D | |
| 623. |
Colchicine is an inhibitory chemical, whichA. Stops the functioning of centriboleB. Prevents attaching of centromeres with raysC. Prevent the spindle formation in mitosisD. Prevents the formation of equatorial plane |
| Answer» Correct Answer - C | |
| 624. |
If a diploid cell is treated with colchicine, then it becomesA. TriploidB. TetraploidC. DiploidD. Monoploid |
| Answer» Correct Answer - B | |
| 625. |
At what stage of cell cycle does DNA synthesis take place ? |
| Answer» Synthetic phase or S-phase of interphase, is the stage of cell cycle where DNA synthesis or replication takes place. | |
| 626. |
In an angiosperm, how many microscope mother cells are required to produce 100 pollen grains ?A. 75B. 100C. 25D. 50 |
| Answer» Correct Answer - C | |
| 627. |
A bivalent of meiosis i consists ofA. Four chromatids and two centromeresB. Two chromatids and one centromeresC. Two chromatids and two centromeresD. Four chromatids and four centromeres |
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Answer» Correct Answer - A A bivalent of meiosis I consists of four chromatids and two centromeres. |
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| 628. |
On treatment with colchicine a diplod cell transformsA. HaploidB. DiploidC. TriploidD. Tetraploid |
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Answer» Correct Answer - D On treatment with colchicine a diploid cell transforms into tetraploid. |
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| 629. |
An anther has 1200 pollen grains. How many pollen mother cells must have been there to produce them ? |
| Answer» Three humdred pollen mother cells have to be there to produce 1200 pollen grains because one pollen mother cell will produce four pollen grains. | |
| 630. |
The points at which crossing over has taken place between homologous chromosomes are called Or Visible expression of the genetic phenomenon of crossing over is calledA. Protein axisB. Synaptonemal complexesC. ChiasmataD. Centromeres split and chromatids separate |
| Answer» Correct Answer - c | |
| 631. |
homologous chromosomes seperates duringA. Metaphase IB. Anaphase IC. Metaphase IID. Anaphase II |
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Answer» Correct Answer - B Homologous chromosomes separate during anaphase I. |
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| 632. |
Cell division is initiated byA. CentrosomeB. CentrioleC. CentromereD. Chromomere |
| Answer» Correct Answer - a | |
| 633. |
Arrange the following events of meiosis in correct sequence (a) Crossing over (b) Synapsis `(c)`Terminalisation of chiasmata (d) Disappearance of nucleolus.A. (ii),(i),(iii),(iv)B. (i),(ii),(iii),(iv)C. (ii),(iii),(iv),(i)D. (ii),(i),(iv),(iii) |
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Answer» Correct Answer - A In meiosis correct sequence is as follows: synapis ,crossing over, termalisation of chiasmata and disappearance of nucleolus. |
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| 634. |
Arrange the following events of meiosis in correct sequence (a) Crossing over (b) Synapsis `(c)`Terminalisation of chiasmata (d) Disappearance of nucleolus.A. II,I,IV,IIIB. II,I,III,IVC. I,II,III,IVD. II,III,IV,I |
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Answer» Correct Answer - B The correct sequence of events of meiosis are synapsis (in zygotene) `to`crossing over (in pachytene)`to`terminalisation of chiasmata (in diplotene)`to`disappearance of nucleolus (in diakinesis). |
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| 635. |
Select the correct option with respect to mitosis A. Chromosomes move to the spindle equator and get aligned along equationl plate in metaphaseB. Chromatids separate but remains in the centre of the cell in anaphaseC. Chromomatids start moving towards opposite poles in telophaseD. Golgi complex and endoplasmic reticulum are still visible at the end of prophase |
| Answer» Correct Answer - A | |
| 636. |
Select the correct option with respect to mitosis A. chromatids start moving towards opposite poles in telophaseB. golgi complex and endoplasmic reticulum are still visible at the end of prophaseC. Chromosomes move to the spindle equator and get aligned along equatorial plate in metaphaseD. Chromatids separate, bur remains I the centre of the cell in anaphase |
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Answer» Correct Answer - C In metaphase of mitosis, spindle fibres attach to kinetochore of chromosomes. Chromosomes are moved to spindle equator and get alligned along metaphasic plate through spindle fibres to both pole. |
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| 637. |
In an organism, if the normal diploid number of chromosmes is 8, how many chromatids are present in each daughter cell at the end of meiosis IA. 2B. 4C. 8D. 16 |
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Answer» Correct Answer - c Because each chromosome bears two chromatids and at the end of meiosis-I chromosome number becomes halved i.e., 4 and number of chromatids are 4xx2=8. |
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| 638. |
Which is not characteristic of meiosisA. Two stages of DNA replication, first before meiosis I and second before meiosis IIB. Recombination and crossing overC. Sister chromatids separate during anaphase IID. Nuclear membrane disappears towards end of prophase |
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Answer» Correct Answer - A Only one stage of DNA replication. |
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| 639. |
Assertion: The process of pairing of the chromosomes is called synapsis. Reason: Synapsis occurs during leptotene stage.A. If both assertion and reason are true and reason is the correct explantion of assertionB. If both assertion and reason are true but reason is not the correct explnantion of assertion.C. If assertion is true but reason is false.D. If both assertion and reason are false. |
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Answer» Correct Answer - C Synapsis occurs during second stage of prophase called zygotene. During this tage chromosomes start pairing together and this process of association is called synapsis. Such paired chromosomes are called homologous chromosomes. Chromosome synapsis is accomparied by the formation of complex strucutre called synaponemal complex. The complex formed by a pair of synapsed homologous chromosomes is called a bivalent or a tetrad. |
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| 640. |
Chromonemata start associating into bivalent chromosomesA. ZygoteneB. LeptoteneC. PachyteneD. Diplotene |
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Answer» Correct Answer - a Paring between the homologous chromosmes takes place in zygotene stage of prophase-I |
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| 641. |
Synapsis I. is pairing of homologous chromosomes. II. Is also called syndesis. III. When begins at the centromere and proceeds towards the ends, is called proterminal. IV. When begins at and proceeds towards centromere, is called procentric. Choose the correct option with correct statement(s).A. Only IB. I and IIC. Only IID. Only III |
| Answer» Correct Answer - B | |
| 642. |
When does pairing/synapsis of homologous chromosomes (bivalent formation) occur in meiosisA. DiploteneB. PachyteneC. ZygoteneD. Leptotene |
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Answer» Correct Answer - C Pairing/synapsis of homologous chromosomes (bivalent formation) occur in zygotene. |
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| 643. |
During synapsis, the number of chromonemata /DNA in bivalent chromosome areA. 2B. 4C. 8D. 16 |
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Answer» Correct Answer - B A bivalent has 2 chromosomes but 4 chromatids and, therefore, 4 Dna/chromomemata. |
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| 644. |
Intimate pairing between the two members of each homologous chromosome pair is initiated by the process called as synapsis, leading to bivalent formation, occurs inA. ZygoteneB. PachyteneC. DiploteneD. Diakinesis |
| Answer» Correct Answer - A | |
| 645. |
If n=16 in plant cell, then how many bivalents in metaphase-I of meiosis are possible ?A. 32 bivalentsB. 16 tetravalentsC. 16 bivalentsD. 32 bivalents |
| Answer» Correct Answer - C | |
| 646. |
___ is the best stage to count the number and study the morphology of chromosomers.A. ProphaseB. metaphaseC. AnaphaseD. Telophase |
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Answer» Correct Answer - B Metaphase is the best phase to count total number of chromosomes in any species and detailed study of morphology of chromosome. Idiogram (arrangement of chromosomes in a series of decreasing length) can be drawn in the stage. |
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| 647. |
Best material to study meiosis isA. root tipB. ovaryC. young antherD. pollen grain. |
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Answer» Correct Answer - C Meiosis takes place in formation of gametes with half the normal chormosome number. Young anters are the best material to study meiosis. |
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| 648. |
At which of the following stages, the chromosomes appear single, thin and thread like?A. LeptoteneB. ZygoteneC. PachyteneD. Diplotene |
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Answer» Correct Answer - A Leptotene also known as leptonema is the first stage of prophase I during which individual chromosomes begin to condense into long strands within the nucleus which are loossely interwoven. However, the two sister chromatids are still so tightly bound that they are indistinguishable from one another. They possess a string of swollen areas called chromomeres. |
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| 649. |
Four different steps that occur during meiosis are given in the following list. (i) Complete separation of chromatids (ii) Pairing of homologous chromosomes (iii) Lining up of paired chromosomes on equator (iv) Crossing over between chromatids Select the correct sequential arrangement of the steps.A. ii,iii,iv,iB. iii,ii,iv,iC. ii,iv,iii,iD. iii,i,ii,iv |
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Answer» Correct Answer - C Pairing of homologous chromosomes occurs in zygotene and crossing over occurs in pachytene stage of prophase I of meiosis I. Paired chromosomes line up on equator in metaphase I. Then there is complete separation of chromatids in anaphase I of meiosis I. |
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| 650. |
During interphase, RNA and proteins are synthesized inA. S phaseB. `G_(1)` phaseC. `G_(2)` phaseD. In both `G_(1)` and `G_(2)` phases |
| Answer» Correct Answer - d | |